ES2843693T3 - Cleaning device for personal cleaning care - Google Patents

Abstract

A cleaning device (2A, 2B, 2D) for personal cleaning care and for converting a reciprocating movement into a rotary movement, comprising: a cleaning device housing (20A, 20B, 20D) removably connected to a housing mango (10); a bracket (21A, 21B, 21D, 22A, 22B, 22D) for supporting the cleaning device (2A, 2B, 2D), removably attached to the cleaning device housing (20A, 20B, 20D); a cleaning element holder (3A, 3B, 3D) and cleaning elements (4A, 4B, 4D) distributed on the cleaning element holder (3A, 3B, 3D), wherein one end of the cleaning element holder cleaning (3A, 3B, 3D) opposite one end of the cleaning element holder (3A, 3B, 3D) having the cleaning elements (4A, 4B, 4D) distributed mates with the cleaning device housing (20A , 20B, 20D) with a stamp (5A, 5B); a cleaning device transducer; a passive assembly that is located above a drive coil (14) in the handle housing (10) and comprises a permanent magnet carrier (26) and a plurality of permanent magnets (24, 25), wherein the Permanent magnet carrier (26) is attached to one end of the cleaning device transducer (23A, 23B, 23C, 23D) opposite a cleaning element carrier coupling shaft (23A5, 23B5), the plurality of permanent magnets (24, 25) to the permanent magnet carrier (26); characterized in that the cleaning device having a natural natural vibration frequency is constituted using the bending stress of an elastic material, so that the natural natural frequency of the cleaning device (2A, 2B, 2D) is in a range of 100 Hz to 400 Hz, and a ratio between the natural frequency fnatural and a frequency f0 of an electromagnetic force generated by the drive coil (14) in the handle satisfies 0.85f0 <fnatural <1.05f0; wherein the cleaning device transducer comprises a transducer holder (21A, 21B, 21D, 22A, 22B, 22D), two transducer elastic elements, that is, the first transducer elastic element (23A1, 23B1, 23C1, 23D1) and the second transducer spring element (23A2, 23B2, 23C2, 23D2), transducer spring element retainers (23A31, 23B31, 23B32, 23C3, 23D3), a transmission arm (23A41, 23A42, 23B41, 23B42, 23C41, 23C42, 23D41, 23D42) of the transducer support coupling elastic element, and the cleaning element carrier coupling shaft (23A5, 23B5), the cleaning element carrier coupling shaft (23A5, 23B5 being inserted ) tightly onto the cleaning element holder (3A, 3B, 3D) so that the cleaning device transducer (23A1, 23B1, 23C1, 23D1, 23A2, 23B2, 23C2, 23D2) is fixedly engaged with the cleaning element holder (3A, 3B, 3D); one end of the transducer spring elements (23A1, 23B1, 23C1, 23D1, 23A2, 23B2, 23C2, 23D2) being fixedly coupled with a corresponding transducer spring element retainer (23A31, 23B31, 23B32, 23C3, 23D3), and coupling the other end of the elastic transducer elements (23A1, 23B1, 23C1, 23D1, 23A2, 23B2, 23C2, 23D2) in a fixed way with the transmission arm (23A41, 23A42, 23B41, 23B42, 23C41, 23C42, 23D41 , 23D42) of the transducer support coupling elastic element; wherein the plurality of permanent magnets (24, 25) are configured such that, when an alternating current flows through the drive coil (14) attached to the handle housing (10), the drive coil ( 14) and the plurality of permanent magnets (24, 25) interact to generate an electromagnetic force, in such a way that a force resulting from the electromagnetic forces generated between the drive coil (14) and the plurality of permanent magnets (24, 25 ) and acting on the passive set is close to zero, that is, the forces acting on the passive set are balanced, and at the same time, the passive set is subjected to a torque that rotates in a clockwise or counterclockwise direction formed by electromagnetic forces; when the current is turned on, the current direction of the current formed by projecting the current in the drive coil (14) onto the plane of the first permanent magnet (24) on the same side is opposite to the current direction of the current formed by projecting the current in the drive coil onto the plane of the second permanent magnet (25) on the same side at the same time; in which the maximum projection zone formed by projecting the minimum plane of the same horizontal section that contains all the permanent magnets (24, 25) of the passive assembly onto a plane perpendicular to an axis of rotation of the cleaning device transducer (23A , 23B, 23C, 23D) is less than 60mm x 60mm.

Description

DESCRIPTION

Cleaning device for personal cleaning care

Technical field

The present invention relates to a cleaning device, and specifically to a cleaning device used for personal cleaning and mounted on a handle housing to convert a reciprocating movement into a rotary movement.

Background

With regard to personal cleaning care appliances such as electric toothbrushes, electric shavers, electric facial hygiene instrument, electric showers, etc., it is important that there should be cleaning devices that can convert the reciprocating movement into a rotary movement. cleaning elements, and these cleaning devices must be structurally simple, easy to assemble, durable in life, and safe and reliable.

Various drive structures are known to drive cleaning elements, such as motors, magnetic systems, and electromagnetic systems. Some drive structures use bearings (such as ball bearings) to support the drive element, and such structures are both expensive and complex, and also have motor and noise damping.

Document CN 100591301C discloses a device for converting a lateral movement into a rotational movement of a workpiece of an apparatus, in which the drive assembly comprises an electromagnet that can generate a lateral force and engage with two permanent magnets in operation, and the permanent magnets are attached to the movable end pieces located at the rear end of the motion conversion assembly to move the end pieces in a slightly arcuate translation manner from side to side. The motion conversion assembly converts the drive action of the drive assembly into the torsional or rotational action of the drive shaft by providing a leaf spring, and the drive shaft then rotates the brush head arm and the brush head. brush so that they rotate about the longitudinal axis of the drive shaft.

CN 101297775B discloses a method for adjusting the elastic elements of a resonant drive system, in which the spring elements do not flex, but by completely changing the stiffness of the elastic elements, their resonant frequency is changed to that is very close to the frequency of actuation of the apparatus. Document US 5263218 A discloses a cleaning device for personal cleansing care and for converting a reciprocating motion into a rotary motion.

Summary

The technical problem to be solved by the present invention is to provide a cleaning device used for personal cleaning care and mounted on a handle housing to convert a reciprocating movement into a rotary movement, and that the cleaning device is structurally simple and compact. , economical, easy to assemble, smoothly rotating, low noise, low damping, safe and reliable, and look even more aesthetically pleasing.

To solve the above technical problem, the present invention provides a cleaning device for personal cleaning care and for converting a reciprocating movement into a rotary movement, as defined in claims 1 and 3.

Preferable embodiments of the invention are set forth in the attached dependent claims.

The prior technical solution has beneficial technological effects as follows. The technical solution of the present invention creatively introduces at least two elastic transducer elements, and the bending stress of the elastic material is used to constitute a cleaning device having a natural vibration frequency f ^natural . According to the principle of vibration, the cleaning device is rotated alternately by the drive frequency f ^ü of the drive coil in the handle housing; when the frequency natural ^natural f of the cleaning device is very close to the driving frequency f ^o, the electromagnetic force generated by the drive coil in the handle housing and acting on the cleaning device takes the cleaning device to a resonance oscillation state; when the natural frequency f ^natural of the cleaning device is equal to the driving frequency f ^o , the electromagnetic force generated by the drive coil in the handle housing and acting on the cleaning device brings the cleaning device to a state resonant vibration. It is well known that the energy transfer efficiency in a resonant oscillation state or resonant vibration state is very high. In the present invention, due to the reasonable configuration of at least two elastic transducer elements and a plurality of permanent magnets, it is possible to achieve smooth rotation of the cleaning device, thereby eliminating some of the restriction parts that must be provided with In order to achieve the rotation of the device cleaning, such as bearings etc. Furthermore, in the present invention, since the plurality of permanent magnets are reasonably arranged so that the resulting electromagnetic force received on the passive assembly is close to zero, and a torque acting on the passive assembly is used ingeniously , it is possible to omit the restriction structure (such as a bearing structure, etc.), and thus, the cleaning device is made more compact in structure, more stable in rotation, and less noisy. Furthermore, compared with a structure in which only one elastic transducer element is provided, the cleaning device structure of the present invention has less noise and higher efficiency.

On the one hand, in order to achieve the purpose of efficient cleaning, the personal cleaning care apparatus is generally required to have a speed of about 6000 to 24000 rpm, that is, the natural frequency of the cleaning device is 100. at 400 Hz. Experiments show that when the natural frequency of the cleaning device is 100 to 400 Hz, a better technological effect is obtained as a result. In addition, the natural frequency fnatural of the cleaning device is 250 Hz. Taking as an example an alternative rotation of 15000 rpm, that is, the natural frequency of the cleaning device is approximately 250 Hz, experiments show that the reciprocating movement at high speed of the cleaning element in the frequency of about 250 Hz can cause the air and liquid around the cleaning element to interact to form a gas explosion, and this irregular turbulence can establish a procedure of accumulating energy and instantly releasing energy that is very effective in removing stubborn stains such as dental plaque on the tooth surface and the like. Still further, the fnatural natural frequency of the cleaning device is in the range of 220 Hz to 280 Hz. Experiments further show that when the natural frequency of the cleaning device is between 220 and 280 Hz, a similar highly effective effect can be achieved. that obtained when the natural frequency is 250 Hz. On the other hand, when 0.85f0 <fnatural <1.05f0 is satisfied, that is, when the natural frequency interval is controlled between 0.85 to 1.05 times the drive frequency fü, experiments show that it is possible to achieve the best resonance oscillation effect and maintain very efficient energy transfer, which is very useful to achieve high-speed reciprocating rotary movement of the cleaning element.

In one embodiment, the elastic transducer elements comprise two elastic transducer elements, i.e. first and second elastic transducer elements, which are parallel to each other and are symmetrically distributed with respect to an axis of rotation or a line parallel to the axis of rotation. rotation, wherein the first and second transducer spring elements are located on both sides of the axis of rotation of the transducer holder respectively and the angle between the first and second transducer spring elements is 180 °. Thus, by providing two elastic transducer elements that have an angle of 180 °, and by arranging two elastic transducer elements to be symmetrically distributed with respect to the axis of rotation or a line parallel to the axis of rotation, it is possible that the forces on all elastic transducer elements are equivalent to the resulting electromagnetic force on the axis of rotation of the cleaning device transducer and the resulting electromagnetic force on the axis of rotation of the cleaning device transducer is substantially zero, and that occurs a torque around the axis of rotation of the cleaning device transducer or a line parallel to the axis of rotation.

In another embodiment, the elastic transducer elements comprise two elastic transducer elements, that is, the first and second elastic transducer elements, which are located on both sides of the axis of rotation of the transducer, and the angle between them is a, where 90 ° <to <180 ° or 90 ° <to <270 °.

The beneficial technological effect of the present technical solution can be explained as follows: for example, assuming that, when the drive coil applies an electromagnetic force to the permanent magnet and the passive assembly is subjected to a clockwise torque, the arm drive of the cleaning device transducer support coupling elastic element transmits a torque to the first and second transducer elastic elements, so that the first transducer elastic element generates a bending stress around the elastic element retainer transducer counterclockwise; the second elastic transducer element also generates a bending stress around the elastic transducer element retainer in the counterclockwise direction of rotation; and the transducer rotates clockwise about an axis of rotation. In contrast, when the passive assembly is subjected to a counterclockwise torque, the transmission arm of the transducer support coupling elastic member of the cleaning device transmits a torque to the first and second transducer elastic members. , so that the first and second transducer spring elements generate clockwise bending stresses around their respective transducer spring element retainers, and the transducer rotates counterclockwise about the axis of rotation. Therefore, according to different occasions and requirements, the angle a can be flexibly adjusted so that the overall force reaches the desired state to maintain optimal performance.

More preferably, the elastic transducer elements may comprise three elastic transducer elements, wherein any two of the elastic transducer elements have an angle p with respect to the third elastic transducer element, and 90 ° <p <180 °, and An angle between the two any elastic transducer elements is 5.5 = 360 ° -2p. By reasonably establishing the shapes, dimensions and relative positions of the first elastic transducer element, the second elastic transducer element and the third elastic transducer element, it is also possible to balance the force on the cleaning device transducer and withstand the torque , and thereby achieve satisfactory effects.

More preferably, the transducer elastic elements comprise rectangular elastic elements or sheet-like elastic elements. Circular elastic elements and sheet-type elastic elements are common elastic elements in industrial applications, and they are easy to obtain from the market.

More preferably, each of the sheet-like elastic elements has a thickness less than its length and width, and the thickness is between 0.05mm and 1mm. The transducer of the present invention is provided with at least two elastic elements; two or more elastic elements can be equivalent to a plurality of springs, and the plurality of springs are equivalent to a virtual spring. The virtual spring and mass m constitute a spring oscillator system. The spring stiffness factor in the spring oscillator system is the stiffness factor of this virtual spring, so the performance of a single elastic element directly affects the spring stiffness factor in the spring oscillator system. Next, a description is made by taking a rectangular elastic member (a kind of sheet-type elastic member) as an example. Definition: K ^irectangular is an equivalent stiffness factor of a single rectangular elastic member when subjected to flexural deformation; the geometric thickness of the rectangular elastic element in the force sense is h; the geometric dimension of the rectangular elastic element in a direction from the force support point towards a fixing point, that is, the direction of the force arm, has a length L and a width b; According to the principle of solid mechanics, the K ^irectangular is directly proportional to bh3 / L3, and the thickness h has a high correlation with the stiffness factor K ^irectangular , therefore by adjusting the thickness h, a different ^{K irectangular can be obtained} . Through experiments and calculations, it is found that when the thickness of the sheet-type elastic member is between 0.05mm and 1mm, the desired stiffness factor can be obtained, and then a better effect can be achieved.

More preferably, the plurality of permanent magnets are configured such that, when an alternating current flows through the drive coil attached to the handle housing and the drive coil, and the plurality of permanent magnets interact to generate an electromagnetic force. , a force resulting from the electromagnetic forces generated between the drive coil and the plurality of permanent magnets and acting on the passive set is close to zero, that is, the force acting on the passive set is balanced, and at the same time , the passive assembly is subjected to a torque that rotates in a clockwise or counterclockwise direction formed by electromagnetic forces, in which the maximum projection zone formed by projecting the minimum plane of the same horizontal section that contains all permanent magnets of the passive assembly on a plane perpendicular to an axis of rotation of the limiting device transducer piece, it is smaller from about 30mm x 30mm to 60mm x 60mm. By reasonably arranging the relative position between the plurality of permanent magnets and the drive coil in the cleaning device, when an alternating current passes through the drive coil, the passive assembly is subjected to a balancing force in which the The resulting electromagnetic force is close to zero, and a torque is generated, the direction of which varies with the variation of the direction of the current in the drive coil, and thus the passive assembly is driven by the drive coil to rotate repeatedly clockwise and counterclockwise, thereby achieving the effect that the resultant force is close to zero, and force equilibrium is reached, while only one torque is generated; therefore, it is possible to omit parts such as bearings, so that the structure is more compact.

More preferably, the plurality of permanent magnets comprise four permanent magnets, that is, two first permanent magnets each having an S pole facing the drive coil, for example, and two second permanent magnets each having one, an N pole facing the drive coil, for example, where the second permanent magnet on the left side and the first permanent magnet on the left side are substantially symmetrically distributed with respect to an iron core drive coil; the first permanent magnet on the right side and the second permanent magnet on the right side are distributed substantially symmetrically with respect to the iron core of the drive coil; a transverse center line of the second permanent magnet on the upper left side is aligned with a transverse center line of the first permanent magnet on the upper right side; a transverse center line of the first permanent magnet on the lower left side is aligned with a transverse center line of the second permanent magnet on the lower right side; the two previous transverse center lines are parallel to each other; and when the current is turned on, at the same time, the current direction of the current formed by projecting the current in the drive coil onto the plane of the first permanent magnet on the same side is opposite to the current direction of the current formed at the project the current in the drive coil onto the plane of the second permanent magnet on the same side. The drive coil is attached to the drive handle. When current I flows through the drive coil, electromagnetic forces F ⁱ , F ² , F ³ , F ⁴ are generated respectively between the drive coil and the four permanent magnets. Since the four permanent magnets are evenly and symmetrically distributed with respect to the iron core of the drive coil, the electromagnetic forces F ⁱ , F ² and F ³ , F ⁴ are essentially equal in magnitude and opposite in direction, that is That is, the resulting electromagnetic force received by the passive assembly is close to zero, that is, the received forces reach an equilibrium, and there is only one torque, so parts such as the bearings can be omitted so that the structure is more compact.

In view of the electric toothbrush and electric shaver, preferably, the maximum projection zone formed by projecting the minimum plane of the same horizontal section containing all the permanent magnets of the passive assembly onto the plane perpendicular to an axis of rotation of the transducer cleaning device is less than or equal to 30mm x 30mm. As for the electric facial hygiene instrument and electric shower, preferably, the maximum projection zone formed by projecting the minimum plane of the same horizontal section containing all the permanent magnets of the passive assembly onto the plane perpendicular to an axis of rotation of the cleaning device transducer is less than or equal to 60 mm x 60 mm. The above two different designs for the maximum projected area mainly consider different applications.

Brief description of the drawings

Fig. 1 is a front view of the cleaning device for personal cleansing care of the present invention;

Figure 2 is a partial sectional view taken along the line A-A in Figure 1;

Figure 3 is a schematic perspective view showing the relative position of the drive coil with respect to the permanent magnets;

Figure 3A is a schematic projection view of the mechanical analysis of the drive coil and permanent magnets shown in Figure 3;

Figure 3B is a schematic view of mechanical analysis of the drive coil and permanent magnets shown in Figure 3;

Figure 3C is another way of configuring the plurality of permanent magnets;

Figure 4 is a front view of a cleaning device for personal cleansing care;

Figure 5 is an exploded schematic view of the cleaning device shown in Figure 4; Figure 6 is a perspective view of the cleaning device transducer in Figure 4;

Figure 7 is a schematic assembly view of the cleaning device transducer and the right bracket of the cleaning device in Figure 4;

Figure 8 is a front view of another type of cleaning device for personal cleansing care;

Figure 9 is an exploded schematic view of the cleaning device shown in Figure 8; Figure 10 is a perspective view of the cleaning device transducer in Figure 8;

Figure 11 is a perspective view of yet another type of cleaning device transducer;

Figure 12 is a schematic view showing the relative position of the two elastic transducer elements in Figure 11;

Figure 13 is a schematic view showing the relative position of three elastic transducer elements; Figure 14 is a front view of the electric facial hygiene instrument;

Figure 15 is an exploded view of the electric facial hygiene instrument shown in Figure 14. Description of main reference numerals

I drive handle

2A, 2B, 2D cleaning device

3A, 3B, 3D cleaning element carrier in cleaning device

4A, 4B, 4D cleaning element (for example, toothbrush bristle)

5A, 5B seal

10 handle housing

I I PCBA electronic circuit board assembly

12 batteries or power supply

13 charging coil

14 drive coil

15 iron core drive coil

16 switch

17 switch button

20A, 20B, 20D different structure cleaning device housings

21A, 21B, 21D Right bracket of the cleaning device for different structures

22A, 22B, 22D Left bracket of the cleaning device for different structures

23A, 23B, 23C, 23D different structure cleaning device transducer

24 first permanent magnet having an S pole facing the handle drive coil

25 second permanent magnet having an N pole facing the handle drive coil

26 permanent magnet carrier

27A, 27B, 27D locking screw

23A1,23B1, 23C1,23D1 first elastic transducer element

23A2, 23B2, 23C2, 23D2 second elastic transducer element

23A31,23B31,23B32, 23C3, 23D3 transducer spring element retainer

23A4, 23B4, 23C4, 23D4 transducer bracket

23A41, 23A42, 23B41, 23B42, 23C41, 23C42, 23D41, 23D42 Transducer bracket coupling elastic element transmission arm

23A5, 23B5 Cleaning Element Carrier Coupling Shaft

23C11, 23C22, 23C33 First, second, third transducer elastic elements respectively Detailed description

Hereinafter, an exemplary embodiment of the present invention will be described in more detail with an electric toothbrush as a typical example of a cleaning device for personal cleansing care, and with reference to the accompanying drawings. Although only the electric toothbrush is used as an example, the present invention is not limited thereto. The present invention can also be applied to electric razors, electric facial hygiene instruments, electric showers, and the like.

Throughout the accompanying drawings, like reference numerals refer to like parts.

For the sake of clarity, the present description employs terms that express relative spatial position, such as "up", "down", "top", "bottom", "left", "right", "transverse", "forward" "," Inversion ", etc., to briefly describe the interrelationships between an element or characteristic and other element (s) or characteristic (s) as shown in the figures, in which" up "," down " , "Upper" and "lower" are relative to the axis of the cleaning device; the upward direction facing the corresponding view and parallel to the axis of the cleaning device is defined as "up" or "upper", and the downward direction parallel to the axis of the cleaning device is defined as "down" or "lower" ; "Left" and "right" are relative to the axis of the cleaning device; the left side of the axis of the cleaning device along the direction perpendicular to the axis of the cleaning device when facing the corresponding view is defined as "left", and the right side thereof is defined as "right"; "Transverse" means the direction perpendicular to the axis of the cleaning device; "Out" means the direction perpendicular to the surface of the paper and facing the user; "Inward" means the direction perpendicular to the paper surface away from the user.

Although the terms "first", "second", etc. are used in the present description to describe a plurality of elements or components, these elements or components are not to be limited by these words. These words are used only to distinguish one item or component from another item or component, not including "order." Therefore, interchanging the ordinal numbers of those elements or components discussed below does not go beyond the conception and scope of the invention.

Furthermore, the word "and / or" as used in this application includes any one of the one or more associated vocabularies or all combinations thereof.

In one embodiment of the present invention, as shown in Figures 1, 2, 5, and 6, a reciprocating cleaning device (eg, toothbrush head) 2A is removably connected to a housing. of handle 10 of a handle 1 through a cleaning device housing 20A of a threaded connection way for example, and such a threaded connection enables the actuating handle 1 and the cleaning device 2A to be reliably connected to each other, and to be conveniently separated. Generally, the operating handle 1 is provided therein with a battery 12 or a power supply, a PCBA electronic circuit board assembly 11, a switch 16, a charging coil 13, and the like. The drive handle 1 of the present invention is also provided with a drive coil 14 therein, and the hollow part of the drive coil 14 is provided with an iron core 15 of the drive coil having a characteristic of high magnetic permeability. The handle housing 10 is also provided with a switch button 17 used to start or stop the operation of the actuator handle 1. The actuator handle 1 is provided with a recess in the direction adjacent to the cleaning device to house part of the device. cleaning.

As shown in Figures 1, 2 and 5, the cleaning device 2A comprises a cleaning device housing 20A, a right cleaning device support 21A and a left cleaning device support 22A to support the cleaning device. 2A, a cleaning device transducer 23A, a passive assembly, a seal 5A, a cleaning element holder 3A, and cleaning elements 4A. The right and left holders 21A, 22A of the cleaning device can be detachably connected and fixed on the cleaning device housing 20A by means of a retainer, such as a screw. As shown in Figure 6, the cleaning device transducer 23A can be integrally molded by injecting, for example, the first transducer elastic member 23A1, the second transducer elastic member 23A2, the transducer holder 23A4, the transducer elastic element retainer 23A31 and the cleaning element carrier coupling shaft 23A5, and can also be assembled from individual parts. The cleaning element holder coupling shaft 23A5 is tightly inserted into the cleaning element holder 3A, so that the cleaning device transducer 23A is fixedly coupled to the cleaning element holder 3A. The cleaning elements 4A is distributed on the cleaning element holder 3A, the cleaning elements 4A being able to be an article such as toothbrush bristles. One end of the seal 5A mates with the cleaning element holder 3A, and the other end of the seal 5A mates with the cleaning device housing 20A. The passive assembly is made up of a plurality of first and second permanent magnets 24, 25 and a permanent magnet carrier 26. The first permanent magnet 24 and the second permanent magnet 25 may have a rectangular parallelepiped shape and are alternately distributed on both sides. of the iron core 15 of the drive coil, and the permanent magnet carrier 26 is attached to the end of the cleaning device transducer 23A opposite the cleaning element carrier coupling shaft 23A5. The plurality of first and second permanent magnets 24, 25 are attached to the permanent magnet holder 26. The polarity of the first permanent magnet 24 in the direction facing the drive coil 14 is opposite to the polarity of the second permanent magnet 25 in the direction facing the drive coil 14.

As shown in Figures 3, 5, 6 and 7, in this example, the passive assembly may comprise for example two first permanent magnets 24 each having a pole S facing the drive coil 14, and therefore For example, two second permanent magnets 25 each having an N pole facing the drive coil 14. The relative positional relationships of the first permanent magnet 24, the second permanent magnet 25 and the drive coil 14 can be shown as in Figure 3. In Figure 3, the second permanent magnet 25 on the left side and the first permanent magnet 24 on the left side in the passive assembly can be distributed substantially symmetrically with respect to the iron core 15 of the drive coil, and the first permanent magnet 24 on the right side and the second permanent magnet 25 on the right side can be distributed substantially symmetrically with respect to the iron core 15 of the coil of drive. The transverse center line of the second permanent magnet 25 on the upper left side is aligned with the transverse center line of the first permanent magnet 24 on the upper right side, and the transverse center line of the first permanent magnet 24 on the lower left side is aligned with the transverse center line of the second permanent magnet 25 on the lower right side, and the two previous transverse center lines are parallel to each other. When the current is turned on, the current direction of the current formed by projecting the current in the drive coil onto the plane of the first permanent magnet on the same side is opposite to the current direction of the current formed by projecting the current in the drive coil on the plane of the second permanent magnet on the same side at the same time.

In the present example shown in Figures 3, 3A, 3B, the drive coil 14 is fixed inside the drive handle 1. When current I flows through the drive coil 14, electromagnetic forces F ^{1 are generated.} , F ² , F ³ , F ⁴ between the drive coil 14 and the first permanent magnet 24 on the right side, the second permanent magnet 25 on the right side, the first permanent magnet 24 on the left side and the second permanent magnet 25 on the left side, respectively. Due to the uniformly symmetrical distribution of the first and second permanent magnets 24, 25 on the left and right sides with respect to the iron core 15 of the drive coil, the electromagnetic forces F ¹ , F ² and F ³ , F ⁴ are essentially equal in magnitude and opposite in sense, that is, the resulting electromagnetic force on the passive assembly is close to zero, that is, the forces on the passive assembly are balanced. As shown in figure 3, since the first and second permanent magnets 24, 25 on both the left and right sides are reasonably distributed, clockwise torques M ¹ , M ² , M ³ , M ^{4 can be generated.} on the passive set by forces F ¹ , F ² , F ³ , F ⁴ , respectively; the torque M is the sum of the torques M ⁱ , M ² , M ³ , M ⁴ , and the vector direction of the torque M is oriented towards the cleaning element. In the direction shown in FIG. 3B, the torque M drives the passive assembly to rotate counterclockwise, and the vector direction of the torque is also oriented toward the cleaning element. points to It should be remembered that the vector directions of the torques in Figures 3 and 3B agree, but due to the direction of the view, in the description, their respective torques are called clockwise and counterclockwise respectively; in fact, the torques in Figures 3 and 3B are the same torque.

Figure 3A is a schematic projection view of the mechanical analysis of Figure 3. Figure 3A shows the direction of each electromagnetic force more clearly. If coordinates are established taking the center point O of the iron core 15 of the drive coil as the origin, the permanent magnets 24, 25 on the left side have the y-axis as the right limit, and the first permanent magnet 24 on the right side. left and the second permanent magnet 25 on the left side are symmetrically distributed with respect to the x-axis. The permanent magnet 24, 25 on the right side have the y axis as the left limit, and the first permanent magnet 24 on the right side and the second permanent magnet 25 on the right side are symmetrically distributed with respect to the x axis; F ¹ , F ² , F ³ and F ⁴ in the figures are forces acting on permanent magnets 24, 25 respectively. Apparently, in the arrangement of permanent magnets 24, 25 and drive coil 14 shown in Figure 3A, the forces F ¹ , F ² , F ^3, and F ⁴ are identical in magnitude; F ¹ and F ² have identical senses; F3 and F4 have identical senses that are opposite to the senses of F ¹ and F ² . Figure 3B is a schematic view of the mechanical analysis of Figure 3, and shows the analytical result obtained by concentrating the forces on point O '. O 'is the geometric center of the group of permanent magnets, and is in the passive set. The line segment OO 'is parallel to or coincides with the axis of rotation of the cleaning device transducer. In Figure 3B, the points O 'and O coincide with each other, and the resulting electromagnetic force received by the passive assembly is zero, and the passive assembly is subjected to the action of the torque M, in which the torque M is the sum of the torques M ¹ , M ² , M ³ , M ⁴ generated by the forces F ¹ , F ² , F ³ , F ⁴ respectively in the counterclockwise direction. Of course, the permanent magnets 24, 25 and the drive coil 14 can also have other arrangements without being limited thereto.

When the current opposite the current I shown in Figure 3 in the direction flows through the drive coil 14, as indicated above, the resulting electromagnetic force acting on the passive assembly is zero, and a torque of counterclockwise torsion, in which the vector direction of the torque is oriented away from one end of the cleaning elements. Therefore, by reasonably arranging the relative position of the permanent magnets 24, 25 and the drive coil 14 in the cleaning device 2A, when an alternating current passes through the drive coil 14, the passive assembly receives a force of equilibrium, in which the resulting electromagnetic force is zero, and a torque is generated, the direction of which varies with the variation of the current direction of the drive coil 14, so that the passive assembly is driven by the drive coil 14 to repeatedly rotate clockwise and counterclockwise. Apparently, the relative positions of the permanent magnets 24, 25 and the drive coil 14 as well as the number of the permanent magnets are not limited to this example, and the person skilled in this art can deduce different arrangements without departing from the scope of the present. invention. For example, the number of permanent magnets 24, 25 can be two, three, five or six, and so on; alternatively, the positions of the permanent magnets 24, 25 on the left side are swapped, or the positions of the permanent magnets 24, 25 on the right side are swapped; alternatively, the permanent magnet plane on the left side and the upper plane of the drive coil 14 are distributed at an angle of p, and the permanent magnet plane on the right side and the upper plane of the drive coil 14 are distributed at an angle of -p.

Figure 3C illustrates an embodiment of six permanent magnets, that is, in addition to the four original permanent magnets, two permanent magnets are reasonably added and arranged with identical functions to those of the four permanent magnets mentioned above, that is, making the area magnetic field projection is larger and the effect better, and obviously there are many other configurations, the principles of which are identical, which will no longer be listed here.

As shown in Figure 3, the N poles of the first permanent magnets 24 and the S poles of the second permanent magnets 25 are immobile fixed to the permanent magnet carrier 26, and the passive assembly is made up of the first magnets. permanent magnets 24, second permanent magnets 25, and permanent magnet carrier 26. Although only one passive assembly is shown in the present embodiment, it is also possible to provide a plurality of passive assemblies that have no relative movement to each other according to the present invention.

Preferably, the maximum projection zone formed by projecting the minimum plane of the same horizontal section containing all the permanent magnets of the passive assembly onto a plane perpendicular to an axis of rotation of the cleaning device transducer is less than or equal to 30 mm x 30mm to 60mm x 60mm, which can be determined based on specific circumstances. For the electric toothbrush and electric shaver, the maximum projection zone formed by projecting the minimum plane of the same horizontal section that contains all the permanent magnets of the passive assembly onto a plane perpendicular to an axis of rotation of the device transducer cleaning is less than or equal to 30mm x 30mm; As for the electric facial hygiene instrument and the electric shower, the maximum projection zone formed by projecting the minimum plane of the same section horizontal containing all permanent magnets of the passive assembly on a plane perpendicular to an axis of rotation of the cleaning device transducer is less than or equal to 60 mm x 60 mm. With this structure, the personal care apparatus of the present invention is more compact and has a more attractive appearance.

In the present invention, efficient movement of the cleaning device can be achieved by the bending characteristic of the elastic elements. Figure 6 shows the effect of the forces F1, F2, F3, F4 on the torsional moment (torque) of the first elastic transducer element 23A1 and the second elastic transducer element 23A2. As shown in figure 6, the permanent magnet 25 on the upper left side is subjected to the force F4 as shown in the figure, and L6 is the force arm L6 of the force F4 with respect to the center line geometry of the second elastic transducer element 23A2, then the electromagnetic force F4 generates a torque M6 with respect to the second elastic transducer element 23A2, M6 = F4 L6; the direction of M6 is clockwise. Similarly, the permanent magnet 24 on the upper right side is subjected to the force Fi, and L5 is the force arm L5 of the force Fi with respect to the geometric center line of the first elastic transducer element 23A1, then the electromagnetic force Fi generates a torque M5 with respect to the first elastic transducer element 23A1, M5 = F1L5; the direction of M5 is counterclockwise. According to the present invention, by reasonably configuring the shape and position of the permanent magnets as well as the shape and position of the elastic transducer elements, M5 and M6 can be made to be approximately equal in magnitude and opposite in direction. Similarly, the torques generated by F3 and F2 with respect to the second elastic transducer element 23A2 and the first elastic transducer element 23A1 are identical in magnitude and opposite in direction. Therefore, the torque resulting from the electromagnetic force on the passive assembly relative to the first elastic transducer element 23A1 and the second elastic transducer element 23A2 is zero. Therefore, as long as the shape and position of the permanent magnets and the shape and position of the elastic transducer elements are reasonably designed, the factor of the section resistant to bending (or modulus of the section in bending) and the factor of the torsionally resistant section (or modulus of the section in torsion) of the elastic elements have little effect on the implementation of the present invention, thus allowing to expand the selection range of the geometric dimensions of the elements. transducer elastics.

As shown in Figures 2, 5, and 6, the passive assembly and the 23A4 cleaning device transducer holder are fixedly coupled to each other without relative movement, and there are many ways for fixed coupling, such as by injection molding or by screws. In order to achieve the purpose of efficient cleaning, the personal care apparatus is generally required to have a speed of about 6000 to 24000 rpm, that is, the fnatural natural frequency of the cleaning device is 100 to 400 Hz; The relationship between the natural frequency fnatural and the frequency fü of the electromagnetic force generated by the drive coil in the handle satisfies: 0.85f0 <fnatural <1.05f0. Experiments show that when the natural frequency of the cleaning device is 100 to 400 Hz, a better technological effect results. Furthermore, the natural frequency fnatural of the cleaning device is 250 Hz more or less, and the ratio between the natural frequency fnatural and the frequency fo of the electromagnetic force generated by the drive coil on the handle satisfies: 0.85f0 <fnatural <1.05f0. Taking as an example an alternative rotation of 15000 rpm, that is, the natural frequency of the cleaning device is approximately 250 Hz; Experiments show that the high-speed reciprocating movement of the cleaning element with the frequency of about 250 Hz can cause the air and liquid around the cleaning element to interact to form a gas explosion, and this irregular turbulence can establish a procedure to accumulate energy and instantly release energy that is very effective in removing stubborn stains such as dental plaque on the tooth surface and the like. Still further, the natural frequency fnatural of the cleaning device is in a range of 220 Hz to 280 Hz, and the relationship between the natural frequency fnatural and the frequency fo of the electromagnetic force generated by the drive coil in the handle satisfies: 0 , 85f0 <fnatural <1.05f0. The experiments further show that when the natural frequency of the cleaning device is between 220 and 280 Hz, a very effective effect similar to that obtained when the natural frequency is 250 Hz can be achieved.

The cleaning device 2A has its own natural frequency fnatural, and this cleaning device 2A can be considered a spring oscillator system consisting of a spring of spring stiffness factor K and a mass m. According to the principle of vibration, the natural frequency fnaturai of the spring oscillator is directly

proportional to '' where K is the spring stiffness factor generated by all the elastic elements in the cleaning device 2A being equivalent to the spring oscillator system, and m is the mass generated by being all the generalized mass in the cleaning device 2A equivalent to the spring oscillator system.

In the present example shown in Figure 6, the passive assembly is made up of a plurality of permanent magnets and the permanent magnet carrier; the passive assembly has a higher density relative to other parts of the cleaning device 2A than the elastic elements 23A1, 23A2, and the passive assembly is at a distal end away from the elastic elements 23A1, 23A2 and therefore has a moment of greater inertia; therefore, the generalized mass of the passive assembly is a prominent component of the mass in the previous spring oscillator system. In this embodiment, the generalized mass of the passive assembly can reach 60% of the mass of the spring oscillator system.

According to the principle of vibration, when the natural frequency of the cleaning device 2A is close to or equal to At the frequency fo of the electromagnetic force generated by the drive coil 14 in the handle housing 10, the personal care apparatus has higher efficiency, and in addition, people always want the personal care apparatus to have a good feeling when touch, therefore its handle 1 cannot be too bulky. Generally speaking, the diameter of the handle 1 should be less than 35mm, and an efficient structure can make the handle 1 smaller so that the personal care apparatus can have an aesthetic exterior. In the present invention, by reasonably designing the generalized mass of the passive assembly and the stiffness factor of the elastic elements, the electromagnetic force of a frequency f0 generated by the drive coil 14 in the handle housing 10 and acting on the device Cleaning device 2A brings the cleaning device 2A to a resonant oscillation state or resonant vibration state, thus an efficient system can be obtained within a small space. According to the present invention, in combination with the selection of the dimension of the passive assembly and the reasonable configuration of the elastic elements, the natural frequency range of the cleaning device 2A can be from 100 Hz to 400 Hz, that is, the cleaning device Cleaning 2A of this example can match the handle 1 of the personal care appliance emitting the electromagnetic force having a frequency between 100 Hz to 400 Hz, and efficient energy transfer can be implemented between the handle 1 and the cleaning device. 2A. In this example, the relationship between the natural frequency fnatural of the cleaning device 2A and the frequency f0 of the electromagnetic force generated by the drive coil 14 on the handle 1 is:

0.85f0 <fnatural <1.05f0.

Preferably, as shown in Figures 2, 5, 6, 7, the transducer spring element retainer 23A31 is fixedly engaged with one end of the first transducer spring element 23A1 and one end of the second transducer spring element 23A2. respectively, and the transmission arms 23A41, 23A42 of the elastic transducer support coupling member are fixedly coupled with the other end of the first elastic transducer member 23A1 and the other end of the second elastic transducer member 23A2, respectively. In this example, the first elastic transducer element 23A1 and the second elastic transducer element 23A2 are parallel to each other, and are symmetrically distributed with respect to the axis of rotation or a line parallel to the axis of rotation. The first transducer elastic member 23A1 and the second transducer elastic member 23A2 are located on both sides of the axis of rotation of the transducer holder 23A4 respectively, and the angle between them is 180 °. The first transducer elastic element 23A1 and the second transducer elastic element 23A2 can be coupled with the transducer holder 23A4 and the transducer elastic element retainer 23A31 through injection molding, and it is also possible to use a single piece of elastic element to be injection molded with transducer holder 23A4 and transducer spring retainer 23A31. In the overall injection molding arrangement, although a single piece of elastic element is used to manufacture the first elastic transducer element 23A1 and the second elastic transducer element 23A2, since the directions of the forces acting on the first elastic element of transducer 23A1 and the second elastic element of transducer 23A2 are different, it can still be considered to be composed of two elastic elements.

In the examples shown in Figures 2, 6 and 7, the cleaning device transducer 23A, the right bracket 21A of the cleaning device and the left bracket 22A of the cleaning device are fixedly connected by the locking screw 27A, wherein the transducer spring member retainer 23A31 is provided with a plurality of U-shaped notches (eg, four as shown in the figures); These U-shaped notches work in conjunction with the corresponding number of projections on the right transducer bracket 21A to determine the relative mounting positions of the cleaning device transducer 23A and the right cleaning device bracket 21A. The transducer spring retainer 23A31 is fixedly connected with the left and right mounts 22A, 21A of the cleaning device by the locking screw 27A and thus there is no relative movement between the transducer spring retainer 23A31 and the left and right supports 22A, 21A of the cleaning device. In this example, the cleaning device transducer holder 23A4 is engaged with the transducer elastic member retainer 23A31 through the first transducer elastic member 23A1 and the second transducer elastic member 23A2. When the cleaning device 2A is not in operation, the transducer 23A is fixed to the left and right supports 22A, 21A of the cleaning device, and the left and right supports 22A, 21A are screwed to the handle housing 10 through the housing. of cleaning device 20A. When the cleaning device 2A is operated, the transducer holder 23A4 and the transducer elastic element retainer 23A31 generate relative motion through the synergistic action of all the elastic elements in the transducer elastic assembly, while the retainer transducer spring element 23A31 is fixedly coupled to the left and right mounts 22A, 21A of the cleaning device and is held in a stationary state and thus only the transducer mount 23A4 moves relative to the element retainer transducer spring 23A31. The cleaning element carrier coupling shaft 23A5 extends upward into the cleaning element carrier 3A, and the above coupling may be a fixed coupling, so that therefore movement and energy are transferred to the cleaning element carrier 3A through the cleaning element carrier coupling shaft 23A5, and then to the cleaning elements 4A through the cleaning element carrier 3A.

As shown in Figures 1, 2, 3, 3B, and 3C, the cleaning device housing 20A has a threaded configuration, and the handle housing 10 has a threaded configuration that matches the threaded configuration of cleaning device housing 20A. In this embodiment, after the cleaning device is partially inserted into the recess in the upper part of the actuator handle 1, the cleaning device 2A is tightly locked to the actuator handle 1 through the threaded coupling of the actuator housing. cleaning device 20A and the handle housing 10. When the user attaches the cleaning device 2A to the drive handle 1 and starts the drive handle 1, an alternating current of a frequency f ^ü flows through the coil of drive 14 of drive handle 1, and the magnetic field generated by permanent magnets 24, 25 of the passive cleaning device assembly interacts with powered drive coil 14 to generate electromagnetic forces. By reasonably setting the number and position of the permanent magnets 24, 25 with respect to the drive coil 14, the electromagnetic force received by the passive assembly is substantially balanced, and a torque M is generated. Due to the alternating current flowing through the drive coil 14, the direction of torque acting on the passive assembly is also alternate, and due to the fixed coupling of the passive assembly with the cleaning device transducer 23A, the cleaning device transducer 23A receives motion and energy from the passive set.

As shown in Fig. 6, assuming that in the initial state, the torque direction of the passive assembly for driving the cleaning device transducer 23A is clockwise, the transducer spring member retainer 23A31 is fixed. to the left and right mounts 22A, 21A of the cleaning device, and the spring assembly is attached to the transducer mount 23A4, when the transducer mount 23A4 is driven by the passive assembly to rotate clockwise, the transmission arm 23A41 of the transducer support coupling elastic member drives the first transducer elastic member 23A1 to flex clockwise, the first transducer elastic member 23A1 generates a bending stress and stores energy, and the first transducer elastic member 23A1 generates a bending stress around the transducer spring member retainer 23A31 in the clockwise direction. If the torque corresponds to the transducer elastic element retainer 23A31, the first transducer elastic element 23A1 is equivalent to being subjected to an ^{inward force F 5} perpendicular to the paper surface in the area of the transmission arm of the elastic element of transducer support coupling, and the force arm thereof is the distance of the equivalent force F5 to the line of contact of the transducer elastic element retainer 23A31 and the first transducer elastic element 23A1 along the direction toward the force F5. At the same time, the transmission arm 23A42 of the transducer support coupling elastic member drives the second transducer elastic member 23A2 to flex clockwise, the second transducer elastic member 23A2 generates a bending stress and stores energy , and the second transducer spring member 23A2 also generates a bending stress around the transducer spring member retainer 23A31 in the clockwise direction. If the torque corresponds to the elastic transducer element retainer 23A31, the second elastic transducer element 23A2 is equivalent to being subjected to an outward force F6 perpendicular to the paper surface in the area of the transmission arm of the elastic coupling element. of transducer support, and the force arm thereof is the distance of the equivalent force F6 to the line of contact of the transducer elastic element retainer 23A31 and the second transducer elastic element 23A2 along the direction toward the force F6. Obviously, the forces received by the elastic assembly are substantially balanced; the cleaning device transducer 23A is only torqued clockwise. Vice versa, when the passive assembly is actuated by the drive coil 14 in the handle housing 10 to rotate counterclockwise, similar to the previous discussion, the forces on the cleaning device transducer 23A are substantially balanced, and cleaning device transducer 23A is only torqued counterclockwise and thus cleaning device transducer 23A reciprocates in response to actuation of drive coil 14 in handle housing 10 The cleaning elements 4A are coupled to the transducer 23A through the cleaning element holder 3A, and the cleaning device transducer 23A drives the cleaning elements 4A to rotate alternately.

As shown in Figures 5 and 6, the present embodiment creatively introduces at least two elastic transducer elements 23A1, 23A2, and the bending stress of the elastic material is used to constitute a cleaning device 2A having a frequency natural vibration f ^natural . According to the vibration principle, it makes the cleaning device 2A rotate alternately by the driving frequency f ^or the driving coil 14 in the handle housing 10. When the ^natural natural frequency f of the cleaning device 2A is Very close to the drive frequency f ⁰ , the electromagnetic force generated by the drive coil 14 in the handle housing 10 and acting on the cleaning device 2A brings the cleaning device 2A into a state of resonance oscillation, when the natural frequency f ^natural of the cleaning device 2A is equal to the driving frequency f ⁰ , the electromagnetic force generated by the drive coil 14 in the handle housing 10 and acting on the cleaning device 2A carries the cleaning device 2A to a state of resonant vibration. It is well known that the energy transfer efficiency in a resonant oscillation state or resonant vibration state is very high. In an existing drive structure using a bearing (for example, the ball bearing), a restriction piece, such as the bearing and so on, is provided to prevent other movements of the cleaning device other than rotational movement; however, such a limitation will lead to noise and energy loss while increasing cost. In the present invention, due to the reasonable configuration of elastic elements and permanent magnets, it is possible to achieve smooth rotation of the cleaning device 2A, thereby eliminating some of the restraining parts that must be provided in order to achieve the rotation of the cleaning device (such as bearings, etc.). In the present invention, since the permanent magnets are reasonably arranged so that the resulting electromagnetic force received on the passive assembly is zero, and a torque acting on the passive assembly is used ingeniously, it is possible to eliminate the structure. restriction and thus the cleaning device is made more compact in structure, more stable in rotation and less noisy. Furthermore, compared with a structure in which only one elastic transducer element is provided, the cleaning device structure of the present invention has less noise and higher efficiency.

Figures 8, 9 and 10 illustrate another type of cleaning device transducer 23B. As shown in the figure, the cleaning device transducer 23B comprises the first transducer elastic element 23B1, the second transducer elastic element 23B2, the transducer holder 23B4, the first transducer elastic element retainer 23B31, the second transducer elastic element retainer 23B32 and cleaning element carrier coupling shaft 23B5, and the above parts can be molded as cleaning device transducer 23B through global injection molding.

The transducer spring retainers 23B31, 23B32 are provided on the outer side of the transducer mount 23B4 respectively, the right and left mounts 21B, 22B of the cleaning device and the transducer spring retainers 23B31, 23B32 engaging each other from fixed way through locking screw 27B. In this example, the first elastic transducer element 23B1 and the second elastic transducer element 23B2 are parallel to each other, and are symmetrically distributed with respect to the axis of rotation or a line parallel to the axis of rotation. The first elastic transducer element 23B1 and the second elastic transducer element 23B2 are located on both sides of the axis of rotation of the transducer holder, the angle between the first elastic transducer element 23B1 and the second elastic transducer element 23B2 being 180 °. Assuming that, when the drive coil 14 applies an electromagnetic force to the permanent magnets 24, 25 and the passive assembly is subjected to a clockwise torque, the transmission arms 23B41, 23B42 of the spring support coupling element cleaning device transducer transmits a torque to the first and second transducer elastic elements 23B1, 23B2, so that the first transducer elastic element 23B1 generates a bending stress around the transducer elastic element retainer 23B31 in the direction counterclockwise, and so that the second transducer spring member 23B2 also generates a bending stress in the counterclockwise direction of rotation around the transducer spring member retainer 23B32. Transducer 23B rotates clockwise about an axis of rotation. On the contrary, when the passive assembly is subjected to a counterclockwise torque, the transmission arms 23B41, 23B42 of the elastic element of the transducer support coupling of the cleaning device transmit a torque to the elastic elements of transducer first and second 23B1, 23B2, so that the first and second transducer spring elements 23B1, 23B2 generate clockwise flexural stresses around respective transducer spring element retainers 23B31, 23B32. The transducer 23B performs a counterclockwise rotation about the axis of rotation. The motion analysis of such a cleaning device is similar to the motion analysis of the above cleaning device.

Figures 11 and 12 illustrate yet another type of cleaning device transducer 23C. With respect to the transducer 23A of the cleaning device 2A, the first transducer elastic member 23C1 and the second transducer elastic member 23C2 in this arrangement are provided on both sides of the axis of rotation of the transducer, and the angle between them is a, where 90 ° <to <180 °, or it can also be 90 ° <to <270 ° The analysis of motion in this arrangement is as indicated above and its principles are identical.

Although the above description has been made with two elastic transducer elements as an example, the present invention is not limited to both as shown in this example. For example, as shown in FIG. 13, transducer 23C may comprise three elastic transducer elements: elastic transducer element 23C11, elastic transducer element 23C22, and elastic transducer element 23C33. The angles of the elastic transducer element 23C11 and the elastic transducer element 23C22 with respect to the elastic transducer element 23C33 can both be p, where 90 ° <p <180 °, and the angle of the elastic transducer element 23C11 with respect to the element 23C22 transducer elastic can be 5, where 5 = 360 ° -2p. As shown in Figure 13, by reasonably establishing the shape and dimension of the elastic transducer element 23C11, the elastic transducer element 23C22 and the elastic transducer element 23C33 as well as the relative positions thereof, it is also possible that the cleaning device transducer 23C is mechanically balanced and torqued.

Of course, more elastic transducer elements can be provided without departing from the scope of the present invention, which will not be listed herein.

The present invention creatively introduces at least two elastic transducer elements, and these elastic transducer elements are distributed around the axis of rotation of the cleaning device transducer or a line parallel to the axis of rotation. The angle between at least two elastic transducer elements is greater than 90 ° and less than 270 °; the angle of the torque applied to the two elastic transducer elements relative to the equivalent force of the respective elastic transducer element retainers is greater than 90 ° and less than 270 °; and the equivalent force and moment of the respective transducer spring element retainers have the same sense. It is preferable to provide two elastic transducer elements having an angle of 180 ° and distribute them symmetrically with respect to an axis of rotation or a line parallel to the axis of rotation so that the forces on all elastic transducer elements are equivalent to the force electromagnetic force about the axis of rotation of the cleaning device transducer and the resulting electromagnetic force is substantially zero, and a torque occurs around the axis of rotation of the cleaning device transducer or a line parallel to the axis of rotation. In a thorough consideration of the mechanical properties and frequency response performances of the elastic transducer elements, it is preferred that the elastic transducer elements in this example are elastic elements of the sheet type. It is further preferred that the thicknesses of the sheet-like elastic elements are less than their lengths and widths. What is most preferred is that the thicknesses of the sheet-like elastic elements are between 0.05mm and 1mm.

The transducer of the present example is provided with at least two elastic elements. Two or more elastic elements can be equivalent to a plurality of springs, and the plurality of springs are equivalent to a virtual spring. The virtual spring and mass m constitute a spring oscillator system. The spring stiffness factor in the spring oscillator system is the stiffness factor of this virtual spring, so the performance of a single elastic element directly affects the spring stiffness factor in the spring oscillator system. Next, a description is made by taking a rectangular elastic member (a kind of sheet-type elastic member) as an example. Definition: Kirectangular is an equivalent stiffness factor of a single rectangular elastic member when subjected to flexural deformation; the geometric thickness of the rectangular elastic element in the force sense is h; the geometric dimension of the rectangular elastic element in a direction from the point of support of force towards a point of fixation, that is to say, the direction of the force arm, has a length L and a width b; According to the principle of solid mechanics, the Kirectangular is directly proportional to bh3 / L3, and the thickness h has a high correlation with the Kirectangular stiffness factor, therefore by adjusting the thickness h, a different Kirectangular can be obtained.

Preferably, the thickness of the sheet-like elastic member is between 0.05mm and 1mm.

The circular elastic elements and the sheet-type elastic element are common elastic elements in industrial applications, and they are easy to obtain from the market. Next, the equivalent stiffness factors for the rectangular elastic member (a type of the sheet-type elastic member) and the circular elastic member, when the elastic member is in a bending motion, are discussed. The diameter of the circular elastic element is defined as d. The magnitude of the equivalent stiffness factor Ki of the elastic element is directly proportional to the range of motion of the cleaning element. Since the Kirectangular equivalent stiffness factor of the rectangular elastic element is proportional to bh3 / L3, the Kicircular equivalent stiffness factor of the circular elastic element is proportional to d4 / L3, therefore for the adjustment of the equivalent stiffness factor Ki, the element Rectangular elastic has an adjustable extension greater than the circular elastic element. For example, if the width b of the rectangular elastic member is set to be i, i times the initial value, the equivalent Kirectangular stiffness factor becomes i, i times the initial value. On the other hand, when the diameter d of the circular elastic element is adjusted to i, i times the initial value, the equivalent stiffness factor Kicircular becomes i, 74 times the initial value. Obviously, the rectangular elastic member is more likely to obtain a different stiffness factor than the circular elastic member when adjusting the geometric dimensions of the parts.

From the above, the rectangular elastic member can achieve an accurate calibration of the Kirectangular equivalent stiffness factor of the elastic member by adjusting the value of the width b of the elastic member, and can also achieve a rough calibration of the Kirectangular equivalent stiffness factor of the elastic element by adjusting the value of the thickness h of the elastic element. The discussions about the sheet-type elastic member and the rectangular elastic member are similar to each other, and considering the dimensions of the part, the sheet-type elastic member is preferable for the present invention.

As noted above, in order to make the personal care apparatus has a conversion efficiency efficient energy, natural ^natural frequency f of the cleaning device should be close or equal to the frequency fo of the electromagnetic force generated by the drive coil in the handle housing 10. Similarly, fnaturai is proportional to ^■ v ^{ji lili} > and in the present example, different values of the stiffness factors K can be obtained by adjusting the thickness h of the sheet-type elastic element , so that 0.85f0 <fnatural <i, 05f0. Figures i4 and i5 illustrate the situation where the present invention is applied to the electric facial hygiene instrument. As shown in the figures, the transducer holder 23D4 mates with the 3D cleaning element holder. When alternating current flows through the drive coil in the handle, an electromagnetic force is generated, and the electromagnetic force drives the cleaning device transducer. With the cleaning device structure of the present invention, energy and movement can be transferred to the cleaning element smoothly, with low noise, highly efficient and with low cost, thereby achieving high-speed reciprocating rotary movement of the cleaning device. cleaning element.

In the course of use, the personal care appliances will inevitably come into contact with the liquid, and therefore the personal care appliance is usually sealed, that is, it is waterproof. Since the handle is

i3

sealed, and the power devices inside the handle have poor heat dissipation condition, it is necessary to control the power consumption of the power devices in the personal care apparatus. According to the present invention, by reasonably distributing the permanent magnets and elastic elements to constitute an efficient movement mechanism, it is possible to improve the efficiency of the personal care apparatus, and ensure that the maximum input power of the electric toothbrush or the electric shaver is less than 6W, ensure that the maximum input power of the electric facial hygiene instrument is less than 10W, and ensure that the maximum input power of the electric shower is less than 15W.

Claims (1)

A cleaning device (2A, 2B, 2D) for personal cleaning care and for converting a reciprocating motion into a rotary motion, comprising: a cleaning device housing (20A, 20B, 20D) removably connected to a handle housing (10); a bracket (21A, 21B, 21D, 22A, 22B, 22D) for supporting the cleaning device (2A, 2B, 2D), removably attached to the cleaning device housing (20A, 20B, 20D); a cleaning element holder (3A, 3B, 3D) and cleaning elements (4A, 4B, 4D) distributed on the cleaning element holder (3A, 3B, 3D), wherein one end of the cleaning element holder cleaning (3A, 3B, 3D) opposite one end of the cleaning element holder (3A, 3B, 3D) having the cleaning elements (4A, 4B, 4D) distributed mates with the cleaning device housing (20A , 20B, 20D) with a stamp (5A, 5B); a cleaning device transducer; a passive assembly that is located above a drive coil (14) in the handle housing (10) and comprises a permanent magnet carrier (26) and a plurality of permanent magnets (24, 25), wherein the Permanent magnet carrier (26) is attached to one end of the cleaning device transducer (23A, 23B, 23C, 23D) opposite a cleaning element carrier coupling shaft (23A5, 23B5), the plurality of permanent magnets (24, 25) to the permanent magnet carrier (26); characterized in that the cleaning device having a natural natural vibration frequency is constituted using the bending stress of an elastic material, so that the natural natural frequency of the cleaning device (2A, 2B, 2D) is in a range of 100 Hz to 400 Hz, and a ratio between the natural frequency fnatural and a frequency fü of an electromagnetic force generated by the drive coil (14) in the handle satisfies 0.85f0 <fnatural <1.05f0; wherein the cleaning device transducer comprises a transducer holder (21A, 21B, 21D, 22A, 22B, 22D), two transducer elastic elements, that is, the first transducer elastic element (23A1, 23B1, 23C1, 23D1) and the second transducer spring element (23A2, 23B2, 23C2, 23D2), transducer spring element retainers (23A31, 23B31, 23B32, 23C3, 23D3), a transmission arm (23A41, 23A42, 23B41, 23B42, 23C41, 23C42, 23D41, 23D42) of the transducer support coupling elastic element, and the cleaning element carrier coupling shaft (23A5, 23B5), the cleaning element carrier coupling shaft (23A5, 23B5) being inserted ) tightly onto the cleaning element holder (3A, 3B, 3D) so that the cleaning device transducer (23A1,23B1,23C1,23D1,23 ^a 2, 23 ^b 2, 23C2, 23D2) engages fixedly with the cleaning element holder (3A, 3B, 3D); one end of the transducer spring elements (23A1, 23B1, 23C1, 23 ^d 1, 23A2, 23B2, 23C2, 23D2) being fixedly coupled with a corresponding transducer spring element retainer (23A31, 23B31, 23B32, 23C3, 23D3 ), and coupling the other end of the elastic transducer elements (23A1, 23B1, 23C1, 23D1, 23A2, 23B2, 23C2, 23D2) in a fixed way with the transmission arm (23A41, 23A42, 23B41, 23B42, 23C41, 23C42 , 23D41, 23D42) of the transducer support coupling elastic element; wherein the plurality of permanent magnets (24, 25) are configured such that, when an alternating current flows through the drive coil (14) attached to the handle housing (10), the drive coil ( 14) and the plurality of permanent magnets (24, 25) interact to generate an electromagnetic force, in such a way that a force resulting from the electromagnetic forces generated between the drive coil (14) and the plurality of permanent magnets (24, 25 ) and acting on the passive set is close to zero, that is, the forces acting on the passive set are balanced, and at the same time, the passive set is subjected to a torque that rotates in a clockwise or counterclockwise direction formed by electromagnetic forces; when the current is turned on, the current direction of the current formed by projecting the current in the drive coil (14) onto the plane of the first permanent magnet (24) on the same side is opposite to the current direction of the current formed by projecting the current in the drive coil onto the plane of the second permanent magnet (25) on the same side at the same time; in which the maximum projection zone formed by projecting the minimum plane of the same horizontal section that contains all the permanent magnets (24, 25) of the passive assembly onto a plane perpendicular to an axis of rotation of the cleaning device transducer (23A , 23 ^b, 23C, 23D) is less than 60 mm x 60 mm. The cleaning device according to claim 1, wherein the first elastic transducer element (23A1,23B1,23C1, 23D1) and the second elastic transducer element (23A2, 23B2, 23C2, 23D2) are located on either side of the axis of rotation of the transducer, and the angle between the first and second transducer elastic elements is a, where 90 ° <a <270 °. A cleaning device (2A, 2B, 2D) for personal cleaning care and for converting a reciprocating motion into a rotary motion, comprising: a cleaning device housing (20A, 20B, 20D) removably connected to a handle housing (10); a bracket (21A, 21B, 21D, 22A, 22B, 22D) for supporting the cleaning device (2A, 2B, 2D), removably attached to the cleaning device housing (20A, 20B, 20D); a cleaning element holder (3A, 3B, 3D) and cleaning elements (4A, 4B, 4D) distributed on the cleaning element holder (3A, 3B, 3D), wherein one end of the cleaning element holder cleaning (3A, 3B, 3D) opposite one end of the cleaning element holder (3A, 3B, 3D) having the cleaning elements (4A, 4B, 4D) distributed mates with the cleaning device housing (20A , 20B, 20D) with a stamp (5A, 5B); a cleaning device transducer; a passive assembly that is located above a drive coil (14) in the handle housing (10) and comprises a permanent magnet carrier (26) and a plurality of permanent magnets (24, 25), wherein the Permanent magnet carrier (26) is attached to one end of the cleaning device transducer opposite a cleaning element carrier engagement shaft (23A5, 23B5), the plurality of permanent magnets (24, 25) being attached to the carrier permanent magnets (26); characterized in that the cleaning device having a natural natural vibration frequency is constituted using the bending stress of an elastic material, so that the natural natural frequency of the cleaning device (2A, 2B, 2D) is in a range of 100 Hz to 400 Hz, and a ratio between the natural frequency fnatural and a frequency fü of an electromagnetic force generated by the drive coil (14) in the handle satisfies 0.85f0 <fnatural <1.05f0, wherein the cleaning device transducer comprises a transducer holder, three transducer elastic elements (23C11, 23C22, 23C33), transducer elastic element retainers, a transducer support coupling elastic element transmission arm, and the cleaning element carrier coupling shaft (23A5, 23B5), the cleaning element carrier coupling shaft (23A5, 23B5) being inserted tightly into the cleaning element carrier (3A, 3B, 3D) of so that the cleaning device transducer is fixedly coupled with the cleaning element holder (3A, 3B, 3D); one end of the three elastic transducer elements (23C11, 23C22, 23C33) being coupled in a fixed manner with a corresponding transducer elastic element retainer, and the other end of the three elastic transducer elements (23C11, 23C22, 23C33) being coupled fixed manner with the transmission arm of the transducer support coupling elastic element; wherein any two (23C11, 23C22) of the three elastic transducer elements have an angle p with respect to the third elastic transducer element (23C33) of the three elastic transducer elements, and 90 ° <p <180 °, and an angle between any two (23C11, 23C22) of the three elastic transducer elements is 5.5 = 360 ° -2p; wherein the plurality of permanent magnets (24, 25) are configured such that, when an alternating current flows through the drive coil (14) attached to the handle housing (10), the drive coil ( 14) and the plurality of permanent magnets (24, 25) interact to generate an electromagnetic force, in such a way that a force resulting from the electromagnetic forces generated between the drive coil (14) and the plurality of permanent magnets (24, 25 ) and acting on the passive set is close to zero, that is, the forces acting on the passive set are balanced, and at the same time, the passive set is subjected to a torque that rotates in a clockwise or counterclockwise direction formed by electromagnetic forces; when the current is turned on, the current direction of the current formed by projecting the current in the drive coil (14) onto the plane of the first permanent magnet (24) on the same side is opposite to the current direction of the current formed by projecting the current in the drive coil onto the plane of the second permanent magnet (25) on the same side at the same time; in which the maximum projection zone formed by projecting the minimum plane of the same horizontal section that contains all the permanent magnets (24, 25) of the passive assembly onto a plane perpendicular to an axis of rotation of the cleaning device transducer (23A , 23B, 23C, 23D) is less than 60mm x 60mm. The cleaning device according to claims 1 or 3, wherein the elastic transducer elements (23A1, 23B1, 23C1, 23D1, 23A2, 23B2, 23C2, 23D2, 23C11, 23C22, 23C33) comprise elements Rectangular elastics or sheet-type elastic elements. The cleaning device according to claim 4, wherein the sheet-like elastic elements each have a thickness less than their length and width, and the thickness is between 0.05mm and 1mm. The cleaning device according to any one of claims 1, 3-5, wherein the maximum projection zone formed by projecting the minimum plane of the same horizontal section that contains all the permanent magnets (24, 25) of the set passive on a plane perpendicular to an axis of rotation of the cleaning device transducer (23A, 23B, 23C, 23D) is less than 30mm x 30mm. The cleaning device according to any one of claims 1, 3-5, wherein the plurality of permanent magnets comprise four permanent magnets (24, 25), that is, two first permanent magnets (24) each having one, an S pole that can face the drive coil (14) and two second permanent magnets (25) each have an N pole that can face the drive coil (14), in which the second permanent magnet (25) on the left side and the first permanent magnet (24) on the left side are symmetrically distributed with respect to an iron core (15) of the drive coil; the first permanent magnet (24) being distributed on the right side and the second permanent magnet (25) on the right side symmetrically with respect to the iron core (15) of the drive coil; a transverse center line of the second permanent magnet (25) being aligned on the upper left side with a transverse center line of the first permanent magnet (24) on the upper right side; a transverse center line of the first permanent magnet (24) being aligned on the lower left side with a transverse center line of the second permanent magnet (25) on the lower right side; the two anterior transverse central lines being parallel to each other. 8. An electric toothbrush or electric shaver for personal cleaning care, comprising a handle and the cleaning device (2A, 2B, 2D) for converting a reciprocating movement into a rotary movement according to any one of claims 1, 3 -5, in which the maximum projection zone formed by projecting the minimum plane of the same horizontal section that contains all the permanent magnets (24, 25) of the passive assembly onto a plane perpendicular to an axis of rotation of the transducer of the device. cleaning (23A, 23B, 23C, 23D) is less than or equal to 30mm x 30mm. 9. An electric facial hygiene instrument or electric shower for personal cleansing care, comprising a handle and the cleaning device (2A, 2B, 2D) for converting a reciprocating movement into a rotary movement according to any one of claims 1, 3-5.